Temperature Zone Standard for SMT Reflow Soldering

The temperature zone standard of SMT reflow soldering, generally speaking, the standard SMT reflow soldering is eight temperature zone reflow soldering. Of course, there are SMT reflow soldering machines in several temperature zones in actual use. This is based on the actual soldered products and SMT patches. It is determined by the actual consideration of the processing manufacturer.

Generally speaking, the more SMT reflow soldering temperature zones, the better the soldering effect. If the soldering quality requirements are relatively high, use SMT reflow with ten temperature zones and twelve temperature zones. There are also many soldering manufacturers. Usually, the common SMT reflow soldering in the market is the SMT reflow soldering with eight temperature zones.

The lead-free solder paste SMT reflow soldering temperature zone is generally divided into a preheating zone, a constant temperature zone, a soldering zone, and a cooling zone. So what are the differences between these temperature zones? What are their respective temperature standards? This is the question we are going to discuss today, come and take a look with me.

1. Preheating zone:

The temperature of the preheating zone is raised to 175 degrees, and the time is about 100S, from which the heating rate of the preheating zone can be obtained.

2. Constant temperature zone:

The maximum temperature in the constant temperature zone is about 200 degrees, the time is 80 seconds, and the difference between the high temperature and the low temperature is 25 degrees.

3. Reflow zone:

The highest temperature in the reflow zone is 245 degrees, the lowest temperature is 200 degrees, and the time to reach the maximum value is about 35/S; the temperature rise rate in the reflow zone is: 45 degrees/35S=1.3 degrees/S According to (how Correctly set the temperature curve), it can be seen that the time for this temperature curve to reach the value is too long. The entire reflow time is about 60S.

4. Cooling zone:

The time in the cooling zone is about 100S, the temperature drops from 245 degrees to about 45 degrees, and the cooling speed is: 245 degrees-45 degrees=200 degrees/100S=2 degrees/S.

SMT reflow soldering eight temperature zone temperature settings: the first zone 160°C, the second zone 180°C, the third zone 185°C, the fourth zone 185°C, the fifth zone 210°C, the sixth zone 250°C, the seventh zone 275°C , Eighth zone 250 ℃. The temperature settings of these temperature zones also need to be adjusted according to the temperature curve reference value given by the solder paste manufacturer and the actual production situation.

In fact, the temperature setting of the eight temperature zones of SMT reflow soldering is not fixed, it can also be adjusted flexibly, but the adjustment needs to be determined according to the quality of the SMT solder paste, the actual soldered product and the SMT reflow machine. Therefore, for the temperature zone standard of SMT reflow soldering, this article is only a reference, not an unchanging temperature zone temperature standard.

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